thanks to john pitcairn for this information: BASIC RECORD/PLAYBACK DELAY SETUP Set up a 4/4 audio click track (trim the sample starts so they are right on the beats). Use real audio, not a software instrument. Rerecord the main outs to a new track via hardware loopback cable. Measure the clicks with reference to bars/beats in the Sample Editor - the clicks should be recorded right on the beat. If the audio driver has a record delay parameter in samples, use that to adjust. If not - use the ASIO Buffer Delay "IN" for coarse adjustment (multiples of buffer). Leave the ASIO Buffer Delay "OUT" at zero. Use the main driver playback delay for final fine adjustment (samples). Do NOT use the Arrange window's delay parameter - it's tempo-dependent! So if you are playing in time with a prerecorded track, your playing is recorded in the correct position to preserve your exact timing on playback. The use of the playback delay to compensate is not ideal, as it will mess with the playback timing vs displayed position of any audio - this has an adverse effect on fine editing, and midi-to-audio sync - but Logic unfortunately does not provide a sample-accurate record delay adjustment, and has not done so since version 3.5... -- very useful, but it points up one simple facet of logic - it isn't a professional piece of kit. much though so many aspects of logic are excellent to be so untogether in this, the single most important issue regarding music - TIMING - is well beyond acceptable. zero out of ten, and no amount of flashy updates covers for it. grrr... andy.